Nissan Altima L32. Instruction — part 1505
TM-364
< COMPONENT DIAGNOSIS >
[CVT: RE0F10A]
P1778 STEP MOTOR - FUNCTION
P1778 STEP MOTOR - FUNCTION
Description
INFOID:0000000004201964
• The step motor's 4 aspects of ON/OFF change according to the signal from TCM. As a result, the flow of line
pressure to primary pulley is changed and pulley ratio is controlled.
• This diagnosis item is detected when electrical system is OK, but mechanical system is NG.
• This diagnosis item is detected when the state of the changing the speed mechanism in unit does not oper-
ate normally.
DTC Logic
INFOID:0000000004201965
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
CAUTION:
• Always drive vehicle at a safe speed.
• Before starting “DTC CONFIRMATION PROCEDURE”, confirm “Hi” or “Mid” or “Low” fixation by
“PRI SPEED” and “VEHICLE SPEED” on “DATA MONITOR MODE”.
• If hi-geared fixation occurred, go to
NOTE:
If “DTC CONFIRMATION PROCEDURE” has been previously performed, always turn ignition switch OFF.
Then wait at least 10 seconds before performing the next test.
1.
CHECK DTC DETECTION
With CONSULT-III
1. Turn ignition switch ON.
2. Select “DATA MONITOR”.
3. Make sure that output voltage of CVT fluid temperature sensor is within the range below.
4. Start engine and maintain the following conditions for at least 30 consecutive seconds.
With GST
Follow the procedure “With CONSULT-III”.
Is “P1778 STEP MOTR/FNC” detected?
YES
>> Go to
NO
>> Check intermittent incident. Refer to
GI-42, "Intermittent Incident"
.
Diagnosis Procedure
INFOID:0000000004201966
1.
CHECK STEP MOTOR SYSTEM
Check step motor system. Refer to
Is the inspection result normal?
DTC
Item
(CONSULT-III screen term)
Malfunction is detected when...
Possible cause
P1778
STEP MOTR/FNC
There is a great difference between the
number of steps for the stepping motor and
for the actual gear ratio.
Step motor
ATF TEMP SEN
: 1.0 – 2.0 V
If out of range, drive the vehicle to decrease the voltage (warm up the fluid) or stop engine to increase the voltage (cool
down the fluid)
TEST START FROM 0 km/h (0 MPH)
CONSTANT ACCELERATION
: Keep 30 sec or more
VEHICLE SPEED
: 10 km/h (6 MPH) or more
ACC PEDAL OPEN
: More than 1.0/8
RANGE
: “D” position
ENG SPEED
: 450 rpm or more
P1778 STEP MOTOR - FUNCTION
TM-365
< COMPONENT DIAGNOSIS >
[CVT: RE0F10A]
C
E
F
G
H
I
J
K
L
M
A
B
TM
N
O
P
YES
>> GO TO 2.
NO
>> Repair or replace damaged parts.
2.
CHECK INPUT SPEED SENSOR (PRIMARY SPEED SENSOR) SYSTEM
Check input speed sensor (primary speed sensor) system. Refer to
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair or replace damaged parts.
3.
CHECK OUTPUT SPEED SENSOR (SECONDARY SPEED SENSOR) SYSTEM
Check output speed sensor (secondary speed sensor) system. Refer to
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair or replace damaged parts.
4.
DETECT MALFUNCTIONING ITEMS
Check TCM connector pin terminals for damage or loose connection with harness connector.
Is the inspection result normal?
YES
NO
>> Repair or replace damaged parts.
TM-366
< COMPONENT DIAGNOSIS >
[CVT: RE0F10A]
SHIFT POSITION INDICATOR CIRCUIT
SHIFT POSITION INDICATOR CIRCUIT
Description
INFOID:0000000004201967
• TCM sends position indicator signals to combination meter by CAN communication line.
• Instruction mode switch position is indicated on shift position indicator.
Component Function Check
INFOID:0000000004201968
1.
CHECK SHIFT POSITION INDICATOR
CAUTION:
Always drive vehicle at a safe speed.
1. Start engine.
2. Check if correct selector lever position (“P”, “N”, “R” or “D”) is displayed as selector lever is moved into
each position.
3. Drive vehicle in the instruction mode, and confirm that the actual gear position and the meter's indication of
the position mutually coincide when selector lever is shifted to the “UP (+ side)” or “DOWN (
− side)” side
(1st
⇔ 6th gear).
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Go to
Diagnosis Procedure
INFOID:0000000004201969
1.
CHECK INPUT SIGNALS
With CONSULT-III
1. Start engine.
2. Check if correct selector lever position (“P”, “N”, “R” or “D”) is displayed as selector lever is moved into
each position.
3. Select “RANGE” on “DATA MONITOR” and read out the value.
4. Drive vehicle in the instruction mode, and confirm that the actual gear position and the meter's indication of
the position mutually coincide when selector lever is shifted to the “UP (+ side)” or “DOWN (
− side)” side
(1st
⇔ 6th gear).
Is the inspection result normal?
YES
>> INSPECTION END
NO-1 >> The actual gear position does not change, or shifting into the instruction mode is not possible (no
gear shifting in the instruction mode possible). Or the shift position indicator is not indicated.
• Check instruction mode switch. Refer to
TM-340, "Component Inspection (Instruction Mode Switch)"
• Check CVT main system (Fail-safe function actuated).
- Perform “SELF-DIAG RESULTS” mode for “TRANSMISSION”.
NO-2 >> The actual gear position changes, but the shift position indicator is not indicated.
• Perform “SELF-DIAG RESULTS” mode for “TRANSMISSION”.
NO-3 >> The actual gear position and the indication on the shift position indicator do not coincide.
• Perform “SELF-DIAG RESULTS” mode for “TRANSMISSION”.
NO-4 >> Only a specific position or positions is/are not indicated on the shift position indicator.
• Check combination meter. Refer to
MWI-38, "CONSULT-III Function (METER/M&A)"
.
SHIFT LOCK SYSTEM
TM-367
< COMPONENT DIAGNOSIS >
[CVT: RE0F10A]
C
E
F
G
H
I
J
K
L
M
A
B
TM
N
O
P
SHIFT LOCK SYSTEM
Description
INFOID:0000000004201970
The selector lever cannot be shifted from “P” position to any other position unless the ignition switch is in the
ON position and the brake pedal is depressed.
Wiring Diagram - CVT SHIFT LOCK SYSTEM - Coupe
INFOID:0000000004201971
ABDWA0085GB
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